Fully upgrade a Titan Subclass.

Achievement Guide for Titan Mastery

Achievement won on 19 Oct 14TA Score for this game: 1,557
Posted on 28 October 14 at 06:17

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The best way I found for getting this achievement, in addition to of course playing the game, is doing Nightfall each week as soon as it is ready. That gives you extra xp. After that, pick up all the bounties that you can, and do them. Vanguard ones were easier for me, but if Crucible is better for you, go ahead. After that, just work on weekly / daily. And once you have exhausted all the bounties you would like to do, and all the daily / weeklies are done, go ahead and do some Vanguard Tigers or play some Crucible. Within 3 days, you should have one subclass maxed.